Sorry for the inline code. GMail's web client - for some unknown reason this morning - won't let me attach a file.
-- begin lamkins-fnhdr.apl
⍝!
∇foo;a;b ⍝;c
1
∇
-- end lamkins-fnhdr.apl
)load lamkins-fnhdr.apl
loading )DUMP file /home/dlamkins/APL/workspaces/lamkins-fnhdr.apl...
WAS CLEAR WS
items_allocated = 16
items[5] = 'foo;'a;'b
idx = 5
==============================================================================
Assertion failed: 0 && "Bad index"
in Function: operator[]
in file: Simple_string.hh:146
Call stack:
----------------------------------------
-- Stack trace at Simple_string.hh:146
----------------------------------------
0x7fc755d9ad65 __libc_start_main
0x43b1a5 main
0x534dbd Workspace::immediate_execution(bool)
0x473435 Command::process_line()
0x493164 Nabla::edit_function(UCS_string const&)
0x492aa9 Nabla::edit()
0x492454 Nabla::start()
0x524fcb UserFunction_header::UserFunction_header(UCS_string)
0x520c8f
0x448741 do_Assert(char const*, char const*, char const*, int)
========================================
SI stack:
==============================================================================
*** immediate_execution() caught other exception ***
1
DEFN ERROR+
∇
^
)more
Bad function header
--
"The secret to creativity is knowing how to hide your sources."
Albert Einstein